The past few decades have seen a remarkable surge in Jewish influences on American culture. Entertainers and artists such as Jerry Seinfeld, Adam Sandler, Allegra Goodman, and Tony Kushner have heralded new waves of television, film, literature, and theater; a major klezmer revival is under way; bagels are now as commonplace as pizza; and kabbalah has become as cool as crystals. Does this broad range of cultural expression accurately reflect what...